Improvement in safety-valves



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G'PAIGE, OF STONEHAM, MASSACHUSETTS.

IMPROVEMENT IN SAFETY-VALVES.

Specification forming part of Letters Patent No. 59,l2l, dated October 23, 1866.

To all whom it may concer/n.'

Be it known that I, WILLIAM BURNE'r'r, of San Francisco, inthe county of San Francisco, in the State of California, have invented a new and Improved Arrangement in Safety-Valves for Steam-Boilers; a-nd I do herebydeclare that the following is a full and exact description thereof, reference being had to the accompanyin gdrawin gs, an d toletters ot'referen ce marked thereon. y

The nature of -my invention consists in a certain arrangement ot' levers and weights of locked safety-valves, the means of operating` the same, and mode of securing the whole from interference, b v which great compactness and economy of construction are. effected. A

To enable others skilled in the art to make and use myinvention, I will proceed to describe its construction and operation by referenceto the drawings, ot' which-- Figure 1 is a side elevation; Fig. 2, an end elevation; Fig. 3, a top view; Fig. 4, a sectional side elevation; Fig. 5, a top view, with the cover, levers, and weight removed to show the manner ot' bolting the outer casing; Figs. 6, 7, and 8, side and top views of the weights employed; Fig. 9, a top view ofthe second lever; Fig. l0, a top view of t-he link by which the first and second levers are connected. Figs. 11, 12, and 13 vare views of devices for securing' the cover of the external case.

The valve employed is a spindle-valve of any ofthe known forms, and the chamber A in which it is contained only diers in. construction from that usually employed in being s0 arranged that, instead of discharging the escaping steam through an opening i'n the side of the chamber directly into the atmosphere, the steam is rst discharged into an annular chamber, B, surrounding the valve-chamber, through an opening, O, at the opposite side of the valve from another opening, D, provided for its final exit. This arrangement is to prevent the valve from being reached from the exit-opening for the purpose of trammeling its operation.

To projectionsl E cast upon the cover F of the valve-chamberAthe first or main lever, G, is pivoted. The long arm of this lever, eX- tending vertically, reaches nearly to the top of the inclosing-case H, which is also mounted on the cover of the valve-chamber, and firmly se-A cured thereto by bolts' I. The short end of this main lever rests on the top of the valvespindle J. Another or second lever, K, the arms of which are also nearly ata right angle,

is pivoted to a bolt or pin, L, which passes horizontally through a chamber, M, cast upon the side of the case H, for the purpose of receiving the second lever,K, and to provide inclosed space for the working ofthe short Varm of the same, which is connected to the top of the main lever G by a link, N.

To the long arm of the second lever, K,is suspended the weight O, which is slotted or mor- Vtised to permit the main lever G to pass vertically through it. This slot. or mortise P is made of sufficient width to prevent any contact with the lever G, and ot' sufficient depth into the body ot' the weight to allow room for the working of the lever. This weight O is made hollow and open at the top, (see Fig. V7,) and is loaded to maximum by filling with va number of iiat weights (see Fig. S) of proper sh ape to tit its interior.

The lon g arm ot' the second lever, K, isdouble or split, so as to permit the main lever G to work in the center, and the ends of the link N are also forked or double, to embrace the head of the main lever and the short end ot' the second lever, K.

Guides R are furnished to prevent side oscillation ofthe weight, which would cramp the levers and prevent free action of the parts it employed at sea. These guides are cast on the'interior of the inclosing-case. The slot or mortise made in the weight to receive the main lever is made sufficiently wide at the top to receive also the long arm ofthe second lever, K, when the weight O is raised toits hi ghestposition.

The cover of the inclosingcase is secured as follows: The cover is furnished with a1ip,Q, which embraces the top of the case, so that it cannot be removed by slipping it sidewise. A hook, S, projecting from the under side of the cover, and Iirmly xed therein, is brought un' der a projection, T, cast on the inside of the case H, by first putting the cover down to a` joint on the top ofthe case, and then turning it round until the hook is brought under the pro jection, as shown at Fig. 11. At the opposite side of the cover an eyebolt, U, (shown separately at Fig. 12,) is introduced through the cover, and is screwed into the casin g until the shoulder of the bolt comes down on the top of cover, when the check-plate V, (shown at Fig. 13,)-employed to prevent the bolt from being unscrewed from its place, is slipped over the head of the bolt, and the long side of this plate, fitting against a suitable projection, W, cast upon the ltop of the cover, prevents the bolt from being turned, without the plate is removed, which is prevented by the use of a padlock applied to the eye of bolt. Onfthe top of the cover of the. external case is mounted a sliding bar, X, between guides Y cast upon the cover. Between these guides, and running parallel therewith, a slot, Z, is made through the cover, so as to reach the interior of the case, topermit the introduction of means by which the lever G may be operated upon to relieve the valve of its load, for the purpose of testing its operative condition.

rJhe sliding bar is provided with a projection, a, upon its lower side, which may -at pleasure be brought in contact with the main lever G, and the weight raised thereby. This sliding bar is also provided with an eye, b, at one of its ends, for the purpose of attaching a strong line to reach any point desired for convenience, and is kept in place by a plate, c, forming a cover, which is secured by riveting after the bar has been put in its seat between the guides. The sliding bar completely cov ers the slot Z when in any position.

To prevent the valve from being interfered with from the inside of the boiler, the lower guide, d, of the'valve-spindle is provided with a cap, e, cast thereon, to prevent the spindle from being wedged against the guide by the which the whole is attached to the boiler, to

prevent the opening from the boiler to the valve. from being plugged.

At Fig. 14 is shown a modification, in which the short arm of the second lever, K, is inverted, said lever being also transferred to the opposite side of the inclosing-case, and a tensile instead of a crushing strain is brought on the link N, connecting the irst and second levers, G and K. This modification is,however,very inferior in many respects, and requires more room or the employment of heavier weights to effect the same object.

What I claim as my inventionand desire to secure by Letters Patent, is-

1. The arrangement ot' the levers and their attachments, substantially as described, and for the purpose specified.

2. The lever and weight, so arranged that the lever passes through and works freely within the body of the weight, substantially as described, and for the purpose specilied.

3. The means herein described for relieving the valve of its load to test its operative condition.

4. The arrangement, substantially as described, for securing the cover of the inclosingcase.

5. The cap provided to prevent the valvespindle from being wedged, substantially as herein described.

WM. BURNETT.

Witnesses EDM. F. BROWN, SAML. J. FRAZIER. 

